Thats absolutely correct. The Logical Postivism (at least, of the Vienna Circle) was nothing more than metaphysics disguised as “antimetaphysics” (as they called themselves at the time).
The Positivist theory of meaning, simply put, said that knowledge about the world (truth) can only be obtained through experience, synthetic a priori truth is meaningless tautology. Which, of course, is a synthetic a priori proposition.